Lamp construction



Patented ltlov. l5, @gli intatteN @FFlQO LAMP CONSTRUCTION.

Application led July 19,

ll/ly present invention relates to electric lamps and has more particular'refer'ence to a miniature lamp thatv is especially designed for use by physicians, surgeons, dentists, and the like in making examinations, diagnosis and treatment.

Lamps of this character must, of necessity, be quite small and at the same time be capable of illuminating an area under inspection to such an extent that the operator may minutely vexamine the a'ected tissue.

Frequently, lamps of this character are mounted upon surgical and dentist instruments such as retractors, speculums, proctoscopes and the like and` when thus used they must be positioned so that they will not interior with the line of vision ot the operator and at the same time /give the desired illuminationyas well as permit the ready use ot ,operating instruments in the cavity into which the speculums, etc., are-1nserted.

llith my present structure ll have provided a lamp that'has a maximum illumination t in a very small size and is designed. so that the light rays will be projected from the v structure in a plane-ot an angle to the axis of the body and said rays be magnified by )assino' through an intedral lenticular eleJ 3D C D ment. fused upon the side ot the lamp tube.

All ot the lamp body excepting the lens is\ treated with opaque material. which peri mits of the use of the light rays in one direction only and prevents the rays reaching the eyes ot the operator. My lamp 1s of li.sh ape, the stem (body) being slightly elongated and the arm (lens) being relatively short so that the lamp may be readily projected trom'or retracted into the hollow or tubular handle of the particular instrument on which it is used.

rlhe construction ot myk lamp permits adjustability of the body with respect to the plug or base in assembly during manufacture so that should a slight tilt of the 4body be desired this can bedone within a limited range ot' 'angularity t Among the objects of my invention are the provisionoit a miniature lamp for surgical use that is compact and novel inconstruction, dependable in use, and which may be economically manufactured and placed on the market it'or a Vreasonable `price. @ther objects will be apparent to others after my invention isu'nderstood, and l prefer to accomplish the aforesaid objects and to carry 1926. Serial No. 123,358.

out my invention in substantially the manner hereinafter fully described and as more particularly pointed out in the claims. Reference is herein made to the accompanying drawings that form a part. of this specification.

ln the drawings Figure l is na vertical side elevation of my nate the same parts wherever they appear throughout the several views.

'lthe base is preferably of the usual type, comprising a tubular metal shell 5, a tapered lower portion 6, terminal plate 7, and contact tip 8. 'lhe conductors or kwire filaments 9 yand 10 are secured at their lower inner Vends respectively to the shell and tip as in- .closed at its inner lower end 13 is inserted into the base and encloses the conductors or `tilaments so that the latter pass through the closed end i3 for connection with the shell and tip. A t

Yl`he hollow body is formed in the lfollowing manner r-a short glass tube M is heated and a lenticular element 15 is fused to one end, the opposite end remaining open, and said tube is then fusedin a transverse position uponthe end of the body tubel2, the

axes of lthe Itubes being atsubstantiallya right angle to each other as indicated in Figure 3. While the tubes are heated a suitable tool is inserted through the portion ot the wall ot tube rll that extends across the end of tube 12 and an opening is made that y establishes communication between the tubes.

The filaments may now be placed in the tube 12 with their coil 11 in proper position with respect to the lens l5 and the lower end 13 of the tube is closed or fused together, and at the same time the end of the lateral tube 14 opposite the lens 15 is likewise closed and fused together as at 16 (-Fig. 2). vWhen the body thus assembled is inserted in the base and the protruding ends of the filaments secured to their respective terminals` the space between the tube 12 and shell 5 is filled with suitable plastic cement 17 which will main-` tain the desired assembly when the same has set. lVhile the cement is still plastic the lamp is placed in a test machine or calibrating device and the body may be adjusted to the proper position with respect to the base by projecting the light rays`upon a target in the test machine. It will be understood that during the assembly operations the interior of the body may be evacuated in any well-known manner.

After the cement has hardened or set the exposed surface of the body excepting the lens 15, is sprayed with zinc according to the wellknown process and then suitably coated with a black paint or enamel to render the same non-refiective. During this final step a band 18 is placed annularly upon the body at the place where it enters the cement or base, which band is removed after the metal spray has been applied so that an uncoated space 19 remains at the place where the band was applied thus providing an insulating air gap that prevents current passing from the Vshell 5 to the metal coating of the body.

A pin or stud 20 projects from the side of the base shell 5 to permit the lamp being inserted in a socket terminal of the bayonetslot type, but it'will be understood the shell may be threaded for assembly with a socket of the threaded type.

What I claim is 1. A miniature lamp comprisin a base, a body consisting of a tube extentcding from said base and a second tube transverse to the first tube, a filament having its ends connected to the respective terminals of the base and-having a looped portion within the second tube, and a lenticular element fused to one end of the second tube whereby to project light rays laterally from said body.

2. In a miniature lamp a tubular body in which a filament is housed and consisting of tubes arranged transverse to each other, and a lens fused to the end of one of said tubes whereby to project the light rays laterally from said body. l

3. In a miniature lamp, a tubular body, a tube closing the outer end of said body and 4in which a filament is looped, and a lens fused in an end of said tube whereby to pro- 'ec the light rays laterally from the said 4. In a miniature lamp, a filament tube, a transverse tube at the end of the filalnent tube, a sprayed metallic coating for said filament and transversetubes to render the same non-light-transmitting and a lens closing a light discharge orifice at one end of the transverse tube.

5. In a miniature lamp, a tubular body, a transverse tube closing the outer end of the tubular body and housing the filament loop, a lens fused to an end of the transverse tube, and a. sprayed metallic coating on said tubular body and transverse tube and rendering the same non-light-transmitting whereby said lens provides the sole means of egress for the light rays from the filaments within the body.

6. The method of forming miniature lamps consisting in fusin a lens to the end of a tube, fusing said tu e to the end of a second tube with their axes intersecting each other, forming a communication between the tubes, and tipping the other open ends of said tubes, the interior of the body being evacuated lduring the assembly.

7. The method of forming miniature lamps consisting in fusing a lens to the end of a tube, fusln said tube to the end of a second tube with' t eir axes intersecting each other, forming a communication between the tubes, tipping the other open ends to said tubes, and covering said tubes with a sprayed metallic' coating, the interior of the body being evacuated during the assembly.

8. In ay lamp, a filament housing. a base in which the same is mounted, and a metallic coating on said housing to render a portion of the same non-light-transmitting, there being an uncoated annular portion on the housing adjacent the base whereby to provide an insulation air-gap between the coating and base. f

9. In a lamp, a filament housing, a base in which the same is mounted, a lens secured to aside portion of the housing to direct light rays lateral to the axis of the housing, and a metallic coating on said housing to render a portion of the same non-light-transmitting whereby the lens provides the sole means of egress for light rays from the. filament, there being an uncoated annular portion on the housing adjacent the base providing an insulation air-gap between the coating and base.

Signed at Chicago, in the county of Cook and State of Illinois, this 7th day of July,

WILL J. CAMERON. 

